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(No Model.) 3 Sheets-Sheet 1.

P. MEDART. MACHINE FOR STRAIGHTENING AND POLISHING SHAPTING.

No. 558,591. Patenedpm 2, 1895.

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` MAGINBPOR STRAIGHTENING AND POLISHING SHAPTING.

No', 558,591'. Patented Apr. 2l, 1896.

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(No Model.) 8 Sheets-Sheet 3.

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MACHINE POR STRAIGHTENING AND POLISHING SHAPTING. No. 558,591. PatentedApr. 21, 1896.

UNITED STATES PATENT PHILIP MEDART, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONEJIALF TO XVILLIAM MEDART, OF SAME PLACE.V

MACHINE FOR STRAIGHTENIN G ANDIPOLISHING SHAFTING..

SPECIFICATION forming part of Letters Patent No. 558,591, dated April 2 1, 1896.

` Appiicatiop ma July 1, 1895. sain No. 554,616. (No model.)

To all whom it may concern/.-

Be it known that I, PHILIP MEDART, a citizen of the United States, residing in the city `of St. Louis and State of Missouri, have invented certain new and useful Improvements in Machines for Straightening and Polishing `Shafting, of which the following is a specifinot been so formed, arranged, andrmounted as to work efficiently to both straighten and polish cold bars or shafts.

ln carrying out my invention I employ two short thick rolls 'arranged on opposite sides of the shaft to be straightened and polished and two guides, one above and the-other be# low the shaft between the rolls. One of the rolls is very slightly concaved, while the other is straight or very slightly convexed. The guides are arranged longitudinally between the rolls, and their inner sides are grooved to 4 conform to the shaft which lies between them.

Improved mechanism is employed for supporting, actuating, and adjusting the rolls and guides, the latter being so formed as to bereadily removed and replaced.

The accompanying drawings show my improvements embodied in a machine which has worked efciently to straighten and polish shafting with great rapidity.

Figure 1 shows a plan View of the machine. Fig. 2 shows a longitudinal section on the line 2 2 of Fig. l. Fig. 3 shows a transverse section on the line 3 3 of Fig. 1. Fig. 3 is a plan View of a roller with straight sides which may beused in place of the convex roller shown in Fig. 2. Fig. 4 shows in longitudinal section guides and the means for actuating them. Fig. 5 shows an end View of that end of the machine where the rolls are mounted. Fig. 6 shows a view of that end of the machine "where the gearing is located.

standards B and at one end supports the straightening mechanism, while at the other end it supports the gearing for driving the straightening mechanism. v j

The straightening and polishing rolls X and Y are mounted in suitable bearings above the bed-plate. The rollX is a short thick roll of comparatively large diameter and is slightlyv concave longitudinally from near one end to the other, a narrow annular space s being left at each end to facilitate the entrance and exit of the shaft. The roll is provided with studaxles mounted in bearings c in a yoke O,whicl1 is pivotally connected at c with the upwardly-` projecting plate d on the slide D. T he connection is preferably made by means of a bolt E, which extends through a perforation in, the plate d and screws into the yoke C, the arrangement being such that the bolt may be loosened to adjust the yoke and the roll carried thereby to the desired angle, and, when l tightened, will hold the yoke firmly in place. The roll Y, which is slightly convex, as shown in Figs. 1 and 2, or straight, as shown in Fig. 3, is in like manner connected to a yoke F, which is adjustably connected by means of the bolt G to an upright H on the bed-plate. The yoke F is shown as arranged to have only a pivotal adjustment. It has no adjustment toward and from the roll X. The slide D is arranged in guides Land it is connected with two parallel adj usting-screws J, which extend through female screws J in the frame J 2, ris-4 ing from the bed-plate, and carry on their outer ends cog-wheels j, which mesh with a long pinion j on a shaft 72, which carries a handwheel J 3. By this means the roll X may be adjusted toward and from the roll Y to accommodate shafts of different diameters.

The shaft of the roll X is connected by exible connections k with a driving-shaft K, which in turn is connected by flexible counections k with a shaft K', having its` bearings in a frame L,which supports the gearing. The shaft y of the roll Y is connected by flexible connections m with a Adriving-shaft M, which is iiexibly connected at m' with a shaft M', mounted in bearings in the frame L. The iexible connections of the shafts K and f M permit the shafts of the rolls X and Y to be adjusted to any desired angle.

Suitable gearing connects the shafts K' and IOO M' with a pinion N on the main driving-shaft 0, which carries fast and loose belt-pulleys l Q. The gearing is such as to drive the rolls X and Y at the same speed and in such direction as to rotate the shaft Z, and as t e rolls are inclined relatively to each other t e shaft Z is fed forward in the direction indicated by the arrow while being rotated.

The guides R and S are arranged between the rolls X and Y on opposite sides of the shaft Z. The adjacent edges r ands of the guides are curved to conform to the shaft against which they bear. The upper guide R is bolted to a frame R', which is connected by bolts r with aneth( l frame R2 above it. The frame R2 is slotted transversely at r3, the bolts which extend through these slots being transversely adjustable therein, .so as to allow the frame R and the guide R carried thereby to be adjusted transversely to conform to the adjustment of the roll X, in order that the edge fr of the guide may be located directly above the center of the shaft Z.

The frame R2 is supported by yokes T, which are provided with guides tin which the guideframes move vertically when adjusted by the adj usting-screws t,which have hand-wheels t2.

The lower guide S is mounted in a frame S, which has lugs s transversely slotted to receive bolts s2, which extend through the slots and are secured to a beam S2. By means of these connections the guide S may be adjusted transversely of the machine correspondingly with the adjustment of the guide R. The beam S2 is formed with inclines s3 on |its under sides, corresponding in shape to the wedges or frustum-shaped blocks U U' located beneath them.- These blocks or wedges bear upon blocks V, having inclined inner faces conforming to the inclined faces of the wedges, which are provided with oppositelyformed screw-threads engaging with the right and left hand threads on the shaft or rod NV, mounted in suitable bearings and provided with a hand-wheel W. By this mechanism the guide S may be raised and loweredl The .mechanism is strong and powerful and economizes space, the hand--wheel being located at the side of the machine within convenient reach of the operator instead of beneath the machine, as would be necessary if adjusting mechanism were used, such as employed for adjusting the upper guide.

The rolls X and Y are preferably chillediron castings; but they may be made of any suitable material. The guides R and S are preferably made of hardened steel when the machine is used for straightening round bars and of wood or other suitable material when used for polishing.

In operation the shaft Z as it passes through the rolls is bent positively, and all crooks and irregularities are thereby removed and obliterated, the shaft as it comes through the rolls being true, even, and perfectly straight.

While the machine is intended especially for straightening and polishing cold shafting, it may be employed for polishing and straightening rods or bars of any kind while either hot or cold, and also for straightening and polishing pipes or other analogous articles which are circular in cross-section.

I claim asmy invention- 1. Ina machine for straightening shafting, the combination of ,the two feeding and straightening rolls, one of which is concave and the other straight or slightly convex, means for supporting and rotating said rolls and for adjusting the angles thereof relatively i to each other, and the guide-bars interposed between said rolls, the organization being such that the guide-bars support and guide the shaft to be straightened on two opposite sides while the rolls bear against the remaining sides thereof.

2. In a machine for straightening shafting, the combination of the two combined feeding and straightening rolls, one of which is concave and the other straight or slightly convex, yokes in which the rolls have bearings, means for adjusting the yokes, and the combined guiding and polishing bars interposed between the rolls.

3f The combination of the rolls, the upper and lower-guides, means for adjusting the upper guide, the frame in which the lower guide is supported and which has inclines on its under side, the Wedges on which the inelines bear, the inclined blocks below the wedges and a right and left hand screw for moving the wedges to raise and lower the guide.

In testimony whereof I have hereunto sub scribed my name. l PHILIP MEDART. Witnesses:

' F. L. IIAYDEL,

WM. MEDART.

IOO 

